Easy, North off the the Colfax exit on I80 East of Des Moines about 20 miles.
Was really impressed by the woods ball fields and helpfulness of staff. Rates are really very reasonable with VIP bonus cards that help save money. I'd be interested to see how costs are compared to other paintball fields as large as this one.
Otherwise, if you go there regardless of skill I'm sure you'll have a great time!